Details:

Personal Author:
Bibawy, Nabil A. ; Emerson, David E. ;
Bibawy, Nabil A. ; Emerson, David E. ; Less -
Corporate Authors:
United States. Bureau of Mines. ;
Description:
"An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen has been developed by the U.S. Bureau of Mines. A single-pan 12-kg analytical balance that has a sensitivity of 3 mg is used to prepare the mixture. The balance will accommodate a cylinder having a volume of approximately 4 l that weighs approximately 5 kg. The method has been improved to a precision of +/-0.04 pct by performing four successive dilutions, by improved handling of gases in the manifold, and by using an improved analytical method to select high-purity gases." - NIOSHTIC-2 NIOSHTIC no. 10008167
Subject:
[+]
Gases.
Helium.
Nitrogen.

Document Type:
Report ;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:c060e1bd265c0d4a56d8364d4f12ac317bd9de60142993219fd144f6d55c074c
File Type:

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